local S = minetest.get_translator(minetest.get_current_modname())
local C = minetest.colorize
local F = minetest.formspec_escape

local LIGHT_ACTIVE_FURNACE = 13

mcl_furnaces = {}

--
-- Formspecs
--

local function active_formspec(fuel_percent, item_percent)
	return table.concat({
		"formspec_version[4]",
		"size[11.75,10.425]",
		"label[0.375,0.375;" .. F(C(mcl_formspec.label_color, S("Furnace"))) .. "]",
		mcl_formspec.get_itemslot_bg_v4(3.5, 0.75, 1, 1),
		"list[context;src;3.5,0.75;1,1;]",

		"image[3.5,2;1,1;default_furnace_fire_bg.png^[lowpart:" ..
		(100 - fuel_percent) .. ":default_furnace_fire_fg.png]",

		mcl_formspec.get_itemslot_bg_v4(3.5, 3.25, 1, 1),
		"list[context;fuel;3.5,3.25;1,1;]",

		"image[5.25,2;1.5,1;gui_furnace_arrow_bg.png^[lowpart:" ..
		(item_percent) .. ":gui_furnace_arrow_fg.png^[transformR270]",
		mcl_formspec.get_itemslot_bg_v4(7.875, 2, 1, 1, 0.2),
		"list[context;dst;7.875,2;1,1;]",

		"label[0.375,4.7;" .. F(C(mcl_formspec.label_color, S("Inventory"))) .. "]",
		mcl_formspec.get_itemslot_bg_v4(0.375, 5.1, 9, 3),
		"list[current_player;main;0.375,5.1;9,3;9]",

		mcl_formspec.get_itemslot_bg_v4(0.375, 9.05, 9, 1),
		"list[current_player;main;0.375,9.05;9,1;]",

		-- Craft guide button temporarily removed due to Luanti bug.
		-- TODO: Add it back when the Luanti bug is fixed.
		--"image_button[8,0;1,1;craftguide_book.png;craftguide;]"..
		--"tooltip[craftguide;"..minetest.formspec_escape(S("Recipe book")).."]"..

		"listring[context;dst]",
		"listring[current_player;main]",
		"listring[context;src]",
		"listring[current_player;main]",
		"listring[context;fuel]",
		"listring[current_player;main]",
	})
end

local inactive_formspec = table.concat({
	"formspec_version[4]",
	"size[11.75,10.425]",
	"label[0.375,0.375;" .. F(C(mcl_formspec.label_color, S("Furnace"))) .. "]",
	mcl_formspec.get_itemslot_bg_v4(3.5, 0.75, 1, 1),
	"list[context;src;3.5,0.75;1,1;]",

	"image[3.5,2;1,1;default_furnace_fire_bg.png]",

	mcl_formspec.get_itemslot_bg_v4(3.5, 3.25, 1, 1),
	"list[context;fuel;3.5,3.25;1,1;]",

	"image[5.25,2;1.5,1;gui_furnace_arrow_bg.png^[transformR270]",

	mcl_formspec.get_itemslot_bg_v4(7.875, 2, 1, 1, 0.2),
	"list[context;dst;7.875,2;1,1;]",

	"label[0.375,4.7;" .. F(C(mcl_formspec.label_color, S("Inventory"))) .. "]",
	mcl_formspec.get_itemslot_bg_v4(0.375, 5.1, 9, 3),
	"list[current_player;main;0.375,5.1;9,3;9]",

	mcl_formspec.get_itemslot_bg_v4(0.375, 9.05, 9, 1),
	"list[current_player;main;0.375,9.05;9,1;]",

	-- Craft guide button temporarily removed due to Luanti bug.
	-- TODO: Add it back when the Luanti bug is fixed.
	--"image_button[8,0;1,1;craftguide_book.png;craftguide;]"..
	--"tooltip[craftguide;"..minetest.formspec_escape(S("Recipe book")).."]"..

	"listring[context;dst]",
	"listring[current_player;main]",
	"listring[context;src]",
	"listring[current_player;main]",
	"listring[context;fuel]",
	"listring[current_player;main]",
})


local receive_fields = function(pos, formname, fields, sender)
	if fields.craftguide then
		mcl_craftguide.show(sender:get_player_name())
	end
end

local function give_xp(pos, player)
	local meta = minetest.get_meta(pos)
	local dir = vector.divide(minetest.facedir_to_dir(minetest.get_node(pos).param2), -1.95)
	local xp = meta:get_int("xp")
	if xp > 0 then
		if player then
			mcl_experience.add_xp(player, xp)
		else
			mcl_experience.throw_xp(vector.add(pos, dir), xp)
		end
		meta:set_int("xp", 0)
	end
end

--
-- Node callback functions that are the same for active and inactive furnace
--

local function allow_metadata_inventory_put(pos, listname, index, stack, player)
	local name = player:get_player_name()
	if minetest.is_protected(pos, name) then
		minetest.record_protection_violation(pos, name)
		return 0
	end
	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	if listname == "fuel" then
		-- Special case: empty bucket (not a fuel, but used for sponge drying)
		if stack:get_name() == "mcl_buckets:bucket_empty" then
			if inv:get_stack(listname, index):get_count() == 0 then
				return 1
			else
				return 0
			end
		end

		-- Test stack with size 1 because we burn one fuel at a time
		local teststack = ItemStack(stack)
		teststack:set_count(1)
		local output, decremented_input = minetest.get_craft_result({ method = "fuel", width = 1, items = { teststack } })
		if output.time ~= 0 then
			-- Only allow to place 1 item if fuel get replaced by recipe.
			-- This is the case for lava buckets.
			local replace_item = decremented_input.items[1]
			if replace_item:is_empty() then
				-- For most fuels, just allow to place everything
				return stack:get_count()
			else
				if inv:get_stack(listname, index):get_count() == 0 then
					return 1
				else
					return 0
				end
			end
		else
			return 0
		end
	elseif listname == "src" then
		return stack:get_count()
	elseif listname == "dst" then
		return 0
	end
end

local function allow_metadata_inventory_move(pos, from_list, from_index, to_list, to_index, count, player)
	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	local stack = inv:get_stack(from_list, from_index)
	return allow_metadata_inventory_put(pos, to_list, to_index, stack, player)
end

local function allow_metadata_inventory_take(pos, listname, index, stack, player)
	local name = player:get_player_name()
	if minetest.is_protected(pos, name) then
		minetest.record_protection_violation(pos, name)
		return 0
	end
	return stack:get_count()
end

local function on_metadata_inventory_take(pos, listname, index, stack, player)
	-- Award smelting achievements
	if listname == "dst" then
		if stack:get_name() == "mcl_core:iron_ingot" then
			awards.unlock(player:get_player_name(), "mcl:acquireIron")
		elseif stack:get_name() == "mcl_fishing:fish_cooked" then
			awards.unlock(player:get_player_name(), "mcl:cookFish")
		end
		give_xp(pos, player)
	end
end

local function on_metadata_inventory_move(pos, from_list, from_index, to_list, to_index, count, player)
	if from_list == "dst" then
		give_xp(pos, player)
	end
end

local function spawn_flames(pos, param2)
	local minrelpos, maxrelpos
	local dir = minetest.facedir_to_dir(param2)
	if dir.x > 0 then
		minrelpos = { x = -0.6, y = -0.05, z = -0.25 }
		maxrelpos = { x = -0.55, y = -0.45, z = 0.25 }
	elseif dir.x < 0 then
		minrelpos = { x = 0.55, y = -0.05, z = -0.25 }
		maxrelpos = { x = 0.6, y = -0.45, z = 0.25 }
	elseif dir.z > 0 then
		minrelpos = { x = -0.25, y = -0.05, z = -0.6 }
		maxrelpos = { x = 0.25, y = -0.45, z = -0.55 }
	elseif dir.z < 0 then
		minrelpos = { x = -0.25, y = -0.05, z = 0.55 }
		maxrelpos = { x = 0.25, y = -0.45, z = 0.6 }
	else
		return
	end
	mcl_particles.add_node_particlespawner(pos, {
		amount = 4,
		time = 0,
		minpos = vector.add(pos, minrelpos),
		maxpos = vector.add(pos, maxrelpos),
		minvel = { x = -0.01, y = 0, z = -0.01 },
		maxvel = { x = 0.01, y = 0.1, z = 0.01 },
		minexptime = 0.3,
		maxexptime = 0.6,
		minsize = 0.4,
		maxsize = 0.8,
		texture = "mcl_particles_flame.png",
		glow = LIGHT_ACTIVE_FURNACE,
	}, "low")
end

local function swap_node(pos, name)
	local node = minetest.get_node(pos)
	if node.name == name then
		return
	end
	node.name = name
	minetest.swap_node(pos, node)
	if name == "mcl_furnaces:furnace_active" then
		spawn_flames(pos, node.param2)
	else
		mcl_particles.delete_node_particlespawners(pos)
	end
end

local function furnace_reset_delta_time(pos)
	local meta = minetest.get_meta(pos)
	local time_speed = tonumber(minetest.settings:get("time_speed") or 72)
	if (time_speed < 0.1) then
		return
	end
	local time_multiplier = 86400 / time_speed
	local current_game_time = .0 + ((minetest.get_day_count() + minetest.get_timeofday()) * time_multiplier)

	-- TODO: Change meta:get/set_string() to get/set_float() for "last_gametime".
	-- In Windows *_float() works OK but under Linux it returns rounded unusable values like 449540.000000000
	local last_game_time = meta:get_string("last_gametime")
	if last_game_time then
		last_game_time = tonumber(last_game_time)
	end
	if not last_game_time or last_game_time < 1 or math.abs(last_game_time - current_game_time) <= 1.5 then
		return
	end

	meta:set_string("last_gametime", tostring(current_game_time))
end

local function furnace_get_delta_time(pos, elapsed)
	local meta = minetest.get_meta(pos)
	local time_speed = tonumber(minetest.settings:get("time_speed") or 72)
	local current_game_time
	if (time_speed < 0.1) then
		return meta, elapsed
	else
		local time_multiplier = 86400 / time_speed
		current_game_time = .0 + ((minetest.get_day_count() + minetest.get_timeofday()) * time_multiplier)
	end

	local last_game_time = meta:get_string("last_gametime")
	if last_game_time then
		last_game_time = tonumber(last_game_time)
	end
	if not last_game_time or last_game_time < 1 then
		last_game_time = current_game_time - 0.1
	elseif last_game_time == current_game_time then
		current_game_time = current_game_time + 1.0
	end

	local elapsed_game_time = .0 + current_game_time - last_game_time

	meta:set_string("last_gametime", tostring(current_game_time))

	return meta, elapsed_game_time
end

local function furnace_node_timer(pos, elapsed)
	--
	-- Inizialize metadata
	--
	local meta, elapsed_game_time = furnace_get_delta_time(pos, elapsed)

	local fuel_time = meta:get_float("fuel_time") or 0
	local src_time = meta:get_float("src_time") or 0
	local src_item = meta:get_string("src_item") or ""
	local fuel_totaltime = meta:get_float("fuel_totaltime") or 0

	local inv = meta:get_inventory()
	local srclist, fuellist

	local cookable, cooked
	local active = true
	local fuel

	srclist = inv:get_list("src")
	fuellist = inv:get_list("fuel")

	-- Check if src item has been changed
	if srclist[1]:get_name() ~= src_item then
		-- Reset cooking progress in this case
		src_time = 0
		src_item = srclist[1]:get_name()
	end

	local update = true
	while elapsed_game_time > 0.00001 and update do
		--
		-- Cooking
		--

		local el = elapsed_game_time

		-- Check if we have cookable content: cookable
		local aftercooked
		cooked, aftercooked = minetest.get_craft_result({ method = "cooking", width = 1, items = srclist })
		cookable = cooked.time ~= 0
		if cookable then
			-- Successful cooking requires space in dst slot and time
			if not inv:room_for_item("dst", cooked.item) then
				cookable = false
			end
		end

		if cookable then -- fuel lasts long enough, adjust el to cooking duration
			el = math.min(el, cooked.time - src_time)
		end

		-- Check if we have enough fuel to burn
		active = fuel_time < fuel_totaltime
		if cookable and not active then
			-- We need to get new fuel
			local afterfuel
			fuel, afterfuel = minetest.get_craft_result({ method = "fuel", width = 1, items = fuellist })

			if fuel.time == 0 then
				-- No valid fuel in fuel list -- stop
				fuel_totaltime = 0
				src_time = 0
				update = false
			else
				-- Take fuel from fuel list
				inv:set_stack("fuel", 1, afterfuel.items[1])
				fuel_time = 0
				fuel_totaltime = fuel.time
				el = math.min(el, fuel_totaltime)
				active = true
				fuellist = inv:get_list("fuel")
			end
		elseif active then
			el = math.min(el, fuel_totaltime - fuel_time)
			-- The furnace is currently active and has enough fuel
			fuel_time = fuel_time + el
		end

		-- If there is a cookable item then check if it is ready yet
		if cookable and active then
			src_time = src_time + el
			-- Place result in dst list if done
			if src_time >= cooked.time then
				inv:add_item("dst", cooked.item)
				inv:set_stack("src", 1, aftercooked.items[1])

				-- Unique recipe: Pour water into empty bucket after cooking wet sponge successfully
				if inv:get_stack("fuel", 1):get_name() == "mcl_buckets:bucket_empty" then
					if srclist[1]:get_name() == "mcl_sponges:sponge_wet" then
						inv:set_stack("fuel", 1, "mcl_buckets:bucket_water")
						fuellist = inv:get_list("fuel")
						-- Also for river water
					elseif srclist[1]:get_name() == "mcl_sponges:sponge_wet_river_water" then
						inv:set_stack("fuel", 1, "mcl_buckets:bucket_river_water")
						fuellist = inv:get_list("fuel")
					end
				end

				srclist = inv:get_list("src")
				src_time = 0

				meta:set_int("xp", meta:get_int("xp") + 1) -- ToDo give each recipe an idividial XP count
			end
		end

		elapsed_game_time = elapsed_game_time - el
	end

	if fuel and fuel_totaltime > fuel.time then
		fuel_totaltime = fuel.time
	end
	if srclist and srclist[1]:is_empty() then
		src_time = 0
	end

	--
	-- Update formspec and node
	--
	local formspec = inactive_formspec
	local item_percent = 0
	if cookable then
		item_percent = math.floor(src_time / cooked.time * 100)
	end

	local result = false

	if active then
		local fuel_percent = 0
		if fuel_totaltime > 0 then
			fuel_percent = math.floor(fuel_time / fuel_totaltime * 100)
		end
		formspec = active_formspec(fuel_percent, item_percent)
		swap_node(pos, "mcl_furnaces:furnace_active")
		-- make sure timer restarts automatically
		result = true
	else
		swap_node(pos, "mcl_furnaces:furnace")
		-- stop timer on the inactive furnace
		minetest.get_node_timer(pos):stop()
	end

	--
	-- Set meta values
	--
	meta:set_float("fuel_totaltime", fuel_totaltime)
	meta:set_float("fuel_time", fuel_time)
	meta:set_float("src_time", src_time)
	if srclist then
		meta:set_string("src_item", src_item)
	else
		meta:set_string("src_item", "")
	end
	meta:set_string("formspec", formspec)

	return result
end

function mcl_furnaces.hoppers_on_try_pull(pos, hop_pos, hop_inv, hop_list)
	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	local stack = inv:get_stack("dst", 1)
	if not stack:is_empty() and hop_inv:room_for_item(hop_list, stack) then
		return inv, "dst", 1
	end
	-- Allow empty bucket extraction
	stack = inv:get_stack("fuel", 1)
	if not stack:is_empty() and not mcl_util.is_fuel(stack) and hop_inv:room_for_item(hop_list, stack) then
		return inv, "fuel", 1
	end
	return nil, nil, nil
end

function mcl_furnaces.hoppers_on_try_push(pos, hop_pos, hop_inv, hop_list)
	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	if math.abs(pos.y - hop_pos.y) > math.abs(pos.x - hop_pos.x) and math.abs(pos.y - hop_pos.y) > math.abs(pos.z - hop_pos.z) then
		return inv, "src", mcl_util.select_stack(hop_inv, hop_list, inv, "src", nil, 1)
	else
		return inv, "fuel", mcl_util.select_stack(hop_inv, hop_list, inv, "fuel", mcl_util.is_fuel, 1)
	end
end

local on_rotate, after_rotate_active
if minetest.get_modpath("screwdriver") then
	on_rotate = screwdriver.rotate_simple
	after_rotate_active = function(pos)
		local node = minetest.get_node(pos)
		mcl_particles.delete_node_particlespawners(pos)
		if node.name == "mcl_furnaces:furnace" then
			return
		end
		spawn_flames(pos, node.param2)
	end
end

minetest.register_node("mcl_furnaces:furnace", {
	description = S("Furnace"),
	_tt_help = S("Uses fuel to smelt or cook items"),
	_doc_items_longdesc = S("Furnaces cook or smelt several items, using a furnace fuel, into something else."),
	_doc_items_usagehelp =
		S("Use the furnace to open the furnace menu.") .. "\n" ..
		S("Place a furnace fuel in the lower slot and the source material in the upper slot.") .. "\n" ..
		S("The furnace will slowly use its fuel to smelt the item.") .. "\n" ..
		S("The result will be placed into the output slot at the right side.") .. "\n" ..
		S("Use the recipe book to see what you can smelt, what you can use as fuel and how long it will burn."),
	_doc_items_hidden = false,
	tiles = {
		"default_furnace_top.png", "default_furnace_bottom.png",
		"default_furnace_side.png", "default_furnace_side.png",
		"default_furnace_side.png", "default_furnace_front.png"
	},
	paramtype2 = "facedir",
	groups = { pickaxey = 1, container = 2, deco_block = 1, material_stone = 1 },
	is_ground_content = false,
	sounds = mcl_sounds.node_sound_stone_defaults(),

	on_timer = furnace_node_timer,
	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta:to_table()
		meta:from_table(oldmetadata)
		local inv = meta:get_inventory()
		for _, listname in ipairs({ "src", "dst", "fuel" }) do
			local stack = inv:get_stack(listname, 1)
			if not stack:is_empty() then
				local p = { x = pos.x + math.random(0, 10) / 10 - 0.5, y = pos.y,
					z = pos.z + math.random(0, 10) / 10 - 0.5 }
				minetest.add_item(p, stack)
			end
		end
		meta:from_table(meta2)
	end,

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec", inactive_formspec)
		local inv = meta:get_inventory()
		inv:set_size("src", 1)
		inv:set_size("fuel", 1)
		inv:set_size("dst", 1)
	end,
	on_destruct = function(pos)
		mcl_particles.delete_node_particlespawners(pos)
		give_xp(pos)
	end,

	on_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		-- Reset accumulated game time when player works with furnace:
		furnace_reset_delta_time(pos)
		minetest.get_node_timer(pos):start(1.0)

		on_metadata_inventory_move(pos, from_list, from_index, to_list, to_index, count, player)
	end,
	on_metadata_inventory_put = function(pos)
		-- Reset accumulated game time when player works with furnace:
		furnace_reset_delta_time(pos)
		-- start timer function, it will sort out whether furnace can burn or not.
		minetest.get_node_timer(pos):start(1.0)
	end,
	on_metadata_inventory_take = function(pos, listname, index, stack, player)
		-- Reset accumulated game time when player works with furnace:
		furnace_reset_delta_time(pos)
		-- start timer function, it will helpful if player clears dst slot
		minetest.get_node_timer(pos):start(1.0)

		on_metadata_inventory_take(pos, listname, index, stack, player)
	end,

	allow_metadata_inventory_put = allow_metadata_inventory_put,
	allow_metadata_inventory_move = allow_metadata_inventory_move,
	allow_metadata_inventory_take = allow_metadata_inventory_take,
	on_receive_fields = receive_fields,
	_mcl_blast_resistance = 3.5,
	_mcl_hardness = 3.5,
	on_rotate = on_rotate,
	_mcl_hoppers_on_try_pull = mcl_furnaces.hoppers_on_try_pull,
	_mcl_hoppers_on_try_push = mcl_furnaces.hoppers_on_try_push,
	_mcl_hoppers_on_after_push = function(pos)
		minetest.get_node_timer(pos):start(1.0)
	end,
})

minetest.register_node("mcl_furnaces:furnace_active", {
	description = S("Burning Furnace"),
	_doc_items_create_entry = false,
	tiles = {
		"default_furnace_top.png", "default_furnace_bottom.png",
		"default_furnace_side.png", "default_furnace_side.png",
		"default_furnace_side.png", "default_furnace_front_active.png",
	},
	paramtype2 = "facedir",
	paramtype = "light",
	light_source = LIGHT_ACTIVE_FURNACE,
	drop = "mcl_furnaces:furnace",
	groups = { pickaxey = 1, container = 2, deco_block = 1, not_in_creative_inventory = 1, material_stone = 1 },
	is_ground_content = false,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	on_timer = furnace_node_timer,

	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta
		meta:from_table(oldmetadata)
		local inv = meta:get_inventory()
		for _, listname in ipairs({ "src", "dst", "fuel" }) do
			local stack = inv:get_stack(listname, 1)
			if not stack:is_empty() then
				local p = { x = pos.x + math.random(0, 10) / 10 - 0.5, y = pos.y,
					z = pos.z + math.random(0, 10) / 10 - 0.5 }
				minetest.add_item(p, stack)
			end
		end
		meta:from_table(meta2:to_table())
	end,

	on_construct = function(pos)
		local node = minetest.get_node(pos)
		spawn_flames(pos, node.param2)
	end,
	on_destruct = function(pos)
		mcl_particles.delete_node_particlespawners(pos)
		give_xp(pos)
	end,

	allow_metadata_inventory_put = allow_metadata_inventory_put,
	allow_metadata_inventory_move = allow_metadata_inventory_move,
	allow_metadata_inventory_take = allow_metadata_inventory_take,
	on_metadata_inventory_move = on_metadata_inventory_move,
	on_metadata_inventory_take = on_metadata_inventory_take,
	on_receive_fields = receive_fields,
	_mcl_blast_resistance = 3.5,
	_mcl_hardness = 3.5,
	on_rotate = on_rotate,
	after_rotate = after_rotate_active,
	_mcl_hoppers_on_try_pull = mcl_furnaces.hoppers_on_try_pull,
	_mcl_hoppers_on_try_push = mcl_furnaces.hoppers_on_try_push,
})

minetest.register_craft({
	output = "mcl_furnaces:furnace",
	recipe = {
		{ "group:cobble", "group:cobble", "group:cobble" },
		{ "group:cobble", "",             "group:cobble" },
		{ "group:cobble", "group:cobble", "group:cobble" },
	}
})

-- Add entry alias for the Help
if minetest.get_modpath("doc") then
	doc.add_entry_alias("nodes", "mcl_furnaces:furnace", "nodes", "mcl_furnaces:furnace_active")
end

minetest.register_lbm({
	label = "Active furnace flame particles",
	name = "mcl_furnaces:flames",
	nodenames = { "mcl_furnaces:furnace_active" },
	run_at_every_load = true,
	action = function(pos, node)
		spawn_flames(pos, node.param2)
	end,
})

-- Legacy
minetest.register_lbm({
	label = "Update furnace formspecs (0.60.0)",
	name = "mcl_furnaces:update_formspecs_0_60_0",
	-- Only update inactive furnaces because active ones should update themselves
	nodenames = { "mcl_furnaces:furnace" },
	run_at_every_load = false,
	action = function(pos, node)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec", inactive_formspec)
	end,
})